Andre Villas-Boas has told Luka Modric to keep his nose out of Tottenham's business before insisting it would be "completely impossible" for the club to sell Gareth Bale.

Modric, who left Spurs this summer, has urged Bale to come and join him at the Bernabeu, telling The Sun: "I know Gareth has a big dream of winning the Champions League and Madrid would be a great club for him to achieve it."

Bale himself has admitted he would like to play abroad at some stage in his career, but Villas-Boas is keen to hang on to the 23-year-old, who has been in sensational form this season.

The Tottenham manager also took a swipe at the Croatian midfielder for meddling in Tottenham's affairs, insisting he should be more worried about Real Madrid's current poor form than the future of Bale.

"I think he should focus more on his club than ours," Villas-Boas told a press conference.

"He has to worry about (Real's) game against Atletico Madrid and about getting in to the quarter-finals of the Champions League

"Obviously Modric is aware of Gareth's performances because of his love for Tottenham and the fact that he is very connected with him and this football club, but it's completely impossible (for Bale to leave).

"We have to protect our assets regarding our objectives. We have to qualify for the Champions League so in order for that to happen we need players that can make the difference. We are not looking to sell."

Bale recently insisted he is happy at White Hart Lane and there is no suggestion that he will try to force his way out in the same way that Modric did.

Revered by the club's fans for his exquisite displays during the first two years at Spurs, Modric angered the supporters by pushing for a transfer to Chelsea before doing the same the following year when Madrid came calling.

Villas-Boas' team have the opportunity to move joint-third in the table on Saturday if they beat Fulham and both Chelsea and West Brom lose.

The Portuguese watched the sacking of his friend Roberto Di Matteo with great dismay, and has been a keen observer of events at Stamford Bridge since Rafael Benitez's highly unpopular appointment as interim manager.

Chelsea's fans have booed Benitez in both games since he took charge, but Villas-Boas reminded Blues supporters of what owner Roman Abramovich has brought to the club since he took over in 2003.

"He arrived at the club and changed its future," said Villas-Boas, who lasted less than nine months as Chelsea boss before Abramovich pulled the trigger.

"Back in 2003 when he bought the club, it was not an easy situation for Chelsea.

"In the end he has put so much up front and changed the fortune of the football club which now has three Premier Leagues, one Champions League and three FA Cups.

"The roll of honour is outstanding since Abramovich arrived so in the end it is very difficult to balance the situation.

"He is entitled to the changes whenever he wants. Sometimes he sets different patterns to what you expect, certainly with managers recently, but you can't argue that his tenure hasn't been successful."

The Spurs boss has Steven Caulker available for Saturday's game after he recovered from illness and he also reported that long-term injury absentees Scott Parker and Benoit Assou-Ekotto are expected to return to full training next week.

"They are extremely important for the club so that will be a big boost," Villas-Boas said.